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Identify your mail service with OpenDKIM and Postfix

Signing your emails with Domainkeys Identified Mail (DKIM) technology provide anti-spam and anti-phishing opportunity and best security experience. In this post I show how to configure OpenDKIM and Postfix.

Overview

As usual I make all configurations on CentOS 6 and Postfix 2.6.6 and OpenDKIM 2.10.3.

Install

The installation process is pretty easy

yum install epel-release
yum install opendkim

Configuration

The configuration can be splitted into two parts: opendkim and postfix configuration and DNS configuration. All my clients come from a local subnet 10.10.254.0/24.